https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97180
Bug ID: 97180
Summary: warning: ‘__builtin___strncat_chk’ on strncat when it
is not necessary
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: nils_beausse at hotmail dot com
Target Milestone: ---
On gcc 9 and gcc 10 this code :
#define size 50
char_table[size]
strcpy(char_table, "");
strncat(char_table, char_table2, size - 1);
will give a warning :
In function ‘strncat’,
inlined from ‘XXX’ at src/YYY.c:56:3:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:136:10: warning:
‘__builtin___strncat_chk’ output may be truncated copying AAA bytes from a
string of length BBB [-Wstringop-truncation]
I understand the warning but i see no reason to that in this case, it seems to
be a bug.
